<?php

/**
 * This is the model class for table "{{tag}}".
 *
 * The followings are the available columns in table '{{tag}}':
 * @property integer $id
 * @property string $name
 * @property integer $frequency
 */
class Tag extends CActiveRecord
{
	/**
	 * @return string the associated database table name
	 */
	public function tableName()
	{
		return '{{tag}}';
	}
	public static function string2array($tags)
	{
		return preg_split('/\s*,\s*/',trim($tags), -1, PREG_SPLIT_NO_EMPTY);
	}

	public static function array2string($tags)
	{
		return implode(', ',$tags);
	}

	/**
	 * @return array validation rules for model attributes.
	 */
	public function rules()
	{
		// NOTE: you should only define rules for those attributes that
		// will receive user inputs.
		return array(
			array('name, frequency', 'required'),
			array('frequency', 'numerical', 'integerOnly'=>true),
			array('name', 'length', 'max'=>128),
			// The following rule is used by search().
			// Please remove those attributes that should not be searched.
			array('id, name, frequency', 'safe', 'on'=>'search'),
		);
	}

	/**
	 * @return array relational rules.
	 */
	public function relations()
	{
		// NOTE: you may need to adjust the relation name and the related
		// class name for the relations automatically generated below.
		return array(
		);
	}

	/**
	 * @return array customized attribute labels (name=>label)
	 */
	public function attributeLabels()
	{
		return array(
			'id' => 'Id',
			'name' => 'Name',
			'frequency' => 'Frequency',
		);
	}
	public function updateFrequency($oldTags, $newTags)
        {
                $oldTags=self::string2array($oldTags);
                $newTags=self::string2array($newTags);
                $this->addTags(array_values(array_diff($newTags,$oldTags)));
                $this->removeTags(array_values(array_diff($oldTags,$newTags)));
        }
         public function addTags($tags)
        {
                $criteria=new CDbCriteria;
                $criteria->addInCondition('name',$tags);
                $this->updateCounters(array('frequency'=>1),$criteria);
                foreach($tags as $name)
                {
                        if(!$this->exists('name=:name',array(':name'=>$name)))
                        {
                                $tag=new Tag;
                                $tag->name=$name;
                                $tag->frequency=1;
                                $tag->save();
                        }
                }
        }

        public function removeTags($tags)
        {
                if(empty($tags))
                        return;
                $criteria=new CDbCriteria;
                $criteria->addInCondition('name',$tags);
                $this->updateCounters(array('frequency'=>-1),$criteria);
                $this->deleteAll('frequency<=0');
        }


	/**
	 * Retrieves a list of models based on the current search/filter conditions.
	 *
	 * Typical usecase:
	 * - Initialize the model fields with values from filter form.
	 * - Execute this method to get CActiveDataProvider instance which will filter
	 * models according to data in model fields.
	 * - Pass data provider to CGridView, CListView or any similar widget.
	 *
	 * @return CActiveDataProvider the data provider that can return the models based on the search/filter conditions.
	 */
	public function search()
	{
		// Warning: Please modify the following code to remove attributes that
		// should not be searched.

		$criteria=new CDbCriteria;

		$criteria->compare('id',$this->id);

		$criteria->compare('name',$this->name,true);

		$criteria->compare('frequency',$this->frequency);

		return new CActiveDataProvider('Tag', array(
			'criteria'=>$criteria,
		));
	}

	/**
	 * Returns the static model of the specified AR class.
	 * @return Tag the static model class
	 */
	public static function model($className=__CLASS__)
	{
		return parent::model($className);
	}
}